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Income Taxes - Narrative (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) state | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2014 USD ($) | Feb. 10, 2017 USD ($) | Dec. 31, 2015 USD ($)
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Statutory federal income tax rate | 24.70% | 24.70% | 35.00% | 35.00% |  |
Income Tax Examination [Line Items] |  |  |  |  |  |
Tax credits and other tax benefits from low-income housing tax credit |  |  | $ 1,100,000 | $ 1,100,000 |  |
Amount recognized as a component of income tax expense related low-income housing tax credit | $ 100,000 | $ 300,000 | 200,000 |  |  |
Investments related to low-income housing tax credits | 1,400,000 | 1,300,000 |  |  |  |
Impairment losses recognized from forfeiture or ineligibility | 0 |  |  | $ 0 |  | $ 0
Future capital commitments related to low-income housing tax credit investments | 4,300,000 |  |  |  |  |
Deferred Tax Assets, Net | $ 20,724,000 | 22,502,000 |  |  |  |
Number of states the company files income tax returns in | state | 10 |  |  |  |  |
Unrecognized tax benefits | $ 1,301,000 | 1,244,000 | $ 1,180,000 |  |  | 1,359,000
Unrecognized tax benefits that would impact effective tax rate | 900,000 | 800,000 |  |  |  | 800,000
Reduction in unrecognized tax benefit that is reasonably possible due to a lapse of statute of limitations | $ 200,000 |  |  |  |  |
Duration of unrecognized tax benefits | 12 months |  |  |  |  |
State and Local Jurisdiction [Member] |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |
State valuation allowance |  |  |  |  |  | $ 0
Other Assets |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |
Deferred Tax Assets, Net | $ 20,700,000 | $ 22,500,000 |  |  |  |
As Recorded by EFSC [Member] |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |
Deferred Tax Assets, State Taxes |  |  |  |  | $ 8,625,000 |

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